Speaking to Empire (via CBM) Arnold Schwarzenegger spoke about his role in Batman & Robin:

I don’t regret it at all. I felt that the character was interesting and two movies before that one Joel Schumacher was at his height. So the decision-making process was not off. At the same time I was doing Eraser over there and Warner Bros. begged me to do the movie….In most cases I don’t regret the movies that failed or were not as good. It’s always easy to be smug in hindsight, right?